Support reading GNU symbol versions in ELFObjectFile

* Add enums and structures for GNU version information.
* Implement extraction of that information on a per-symbol basis (ELFObjectFile::getSymbolVersion).
* Implement a generic interface, GetELFSymbolVersion(), for getting the symbol version from the ObjectFile (hides the templating).
* Have llvm-readobj print out the version, when available.
* Add a test for the new feature: readobj-elf-versioning.test



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152436 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 56 insertions, 0 deletions

diff --git a/test/Object/Inputs/elf-versioning-test.i386 b/test/Object/Inputs/elf-versioning-test.i386
new file mode 100755
index 0000000000..c7c1eac497
--- /dev/null
+++ b/test/Object/Inputs/elf-versioning-test.i386
diff --git a/test/Object/Inputs/elf-versioning-test.x86_64 b/test/Object/Inputs/elf-versioning-test.x86_64
new file mode 100755
index 0000000000..cba79baeb4
--- /dev/null
+++ b/test/Object/Inputs/elf-versioning-test.x86_64
diff --git a/test/Object/Inputs/elfver.S b/test/Object/Inputs/elfver.S
new file mode 100644
index 0000000000..ba63279c7a
--- /dev/null
+++ b/test/Object/Inputs/elfver.S
@@ -0,0 +1,31 @@
+# Compile with:
+#   ARGS="-shared -nostdlib -Wl,--version-script=elfver.script"
+#   clang $ARGS -m32 elfver.S -lc -o elf-versioning-test.i386
+#   clang $ARGS -m64 elfver.S -lc -o elf-versioning-test.x86_64
+
+# Also, strip off non-dynamic symbols:
+#   strip elf-versioning-test.i386
+#   strip elf-versioning-test.x86_64
+
+#ifdef __i386__
+.symver _puts, puts@GLIBC_2.0
+#else
+.symver _puts, puts@GLIBC_2.2.5
+#endif
+call _puts@PLT
+
+.symver foo1, foo@VER1
+.globl foo1
+.type foo1, @function
+foo1:
+  ret
+
+.symver foo2, foo@@VER2
+.globl foo2
+.type foo2, @function
+foo2:
+  ret
+
+.globl unversioned_define
+.type unversioned_define, @function
+unversioned_define:
diff --git a/test/Object/Inputs/elfver.script b/test/Object/Inputs/elfver.script
new file mode 100644
index 0000000000..1316fcb84c
--- /dev/null
+++ b/test/Object/Inputs/elfver.script
@@ -0,0 +1,10 @@
+VER1 {
+  global:
+    foo;
+};
+
+VER2 {
+  global:
+    foo;
+} VER1;
+
diff --git a/test/Object/readobj-elf-versioning.test b/test/Object/readobj-elf-versioning.test
new file mode 100644
index 0000000000..0906f344e2
--- /dev/null
+++ b/test/Object/readobj-elf-versioning.test
@@ -0,0 +1,15 @@
+RUN: llvm-readobj %p/Inputs/elf-versioning-test.i386 \
+RUN:         | FileCheck %s -check-prefix ELF
+RUN: llvm-readobj %p/Inputs/elf-versioning-test.i386 \
+RUN:         | FileCheck %s -check-prefix ELF32
+RUN: llvm-readobj %p/Inputs/elf-versioning-test.x86_64 \
+RUN:         | FileCheck %s -check-prefix ELF
+RUN: llvm-readobj %p/Inputs/elf-versioning-test.x86_64 \
+RUN:         | FileCheck %s -check-prefix ELF64
+
+ELF: foo@@VER2          FUNC  {{[0-9a-f]+}} {{[0-9a-f]+}} {{[0-9a-f]+}} global
+ELF: foo@VER1           FUNC  {{[0-9a-f]+}} {{[0-9a-f]+}} {{[0-9a-f]+}} global
+ELF: unversioned_define FUNC  {{[0-9a-f]+}} {{[0-9a-f]+}} {{[0-9a-f]+}} global
+
+ELF32: puts@GLIBC_2.0   FUNC {{[0-9a-f]+}} {{[0-9a-f]+}} {{[0-9a-f]+}} undef,global
+ELF64: puts@GLIBC_2.2.5 FUNC {{[0-9a-f]+}} {{[0-9a-f]+}} {{[0-9a-f]+}} undef,global